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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08fe1bfa50a00afb3f8cc10459d56aec28451380e3bfbc3acd3b28408abed264' 
  AND token = 'nA1Cw3iVHoH2dWqIdeby7KDn8gZ0N2eMCCMDBKOE3Dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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