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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e384f07bb2a116070ca54c05b6f76692e22044a7b5d67a1c905a2d287e8a9a87' 
  AND token = '71Salpoz6wJJOOdecV4Pn/nC7rkXs1HSoMEBnF/Og08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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