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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f946c3cf7db80136f9fabac9dec9b144085039c3165fb87fa8768cb4e7b23fe7' 
  AND token = 'VSvSxrQLN8w4eWLgVpNY9vSPNC/BVHGs7A6OVxke3s4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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