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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '383a7effb144101f7837b5ab0d10706acc16c5eb2ee07c94ec75383b522a2cf3' 
  AND token = 'OhSUkCpFuUp7PIJdiCL1TC0H2nPncSmqyN+A4K71Qp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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