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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c60cdea8fc9cf25e8817d24c138ff8e5a0d3fb3f3cd03aed17434adc4f5786d' 
  AND token = 'osWacHnZ65d5PcjVoE4PsQCxfGUAnFTpC6+SWAUhc/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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