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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd5fe421a2d20b1a580e7451fd938d4a1d23a864ca5001f4cc62cc3236960b9e' 
  AND token = '/8nwei0Ofie8k6KW/D/r1n9iBn8rP7UuhfLI1jmpedY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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