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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da04b110d879061f3aff4035dcb2e3e19be44a437db9f81d696469f16127e582' 
  AND token = 'Shul64W4+4jTod7cm7m9pOpJkP9w09pguiHDRvA631o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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