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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a20360c3554601669694fb72f627d29ebddee4744c97fd9a4dc8dcca2c8f6ab' 
  AND token = '2hYANtqocmdHUI/xpf1oC3OWBJdxcJzFZqO864VkD6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}