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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c4a2fb4fc681c87b1b6a83fe49bb1b7b09af0891e78da230ab238a38a4a2df9' 
  AND token = 'CXISXJBNKBI8Crbjo3mQ8zYCzeyoLHUwlzo8NXaOX98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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