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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12b0f3cfb5a86f8bf177523db08dc621a2c3ac5ffb611ab03fc96fbe1a425ed4' 
  AND token = 'a+u61PRS3Fq9/APxLfV7SxeczoXiVVIvRw5RJ/2UfOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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