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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3fac3a708309e12e867a906edab9e6205830238c857e254674fff1841f9eff4' 
  AND token = 'hSmBAdXhi/L8E9waWLSyhPcNjrc5JWC1cPUm+gYAnWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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