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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efda955027f5c1640d9116baaa480b7fbe296f7bb508a040abd1cd0d6e51c171' 
  AND token = 'SjMbEacAk0Kj/EGneDLac3tfr/Niky2l+Kk9Z/aQr4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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