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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '234c2e6fa31e5337b54eaf94c193ee188fceffed8c3f20f6c908d2c6072ba4c0' 
  AND token = 'pxEBRnx8KNr4NhqzMcKhr+BumRov8WQD1vNPX3l03KE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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