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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b313d8e07e059eb5d02759b6cf91f17ada3969a64209b6529a24bda64bc8ddd9' 
  AND token = 'Ernpvg1A0RFjSY6Kzl4JM0Ux+LLXo1bzf2Jq9fGpfY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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