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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2342e837f59d480b04a5dfe6e6106f1d5143619e7a53f5e4f62f775385c186ba' 
  AND token = 'gOY25sxlGFEc2OaHQjmDgcfS7NvCA9dlP+3f2woD158=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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