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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e20e0c73e0e77874b789a8219480e1d9919cffdd23bb9c897286b9ff43ab22ab' 
  AND token = 'dIzGO0l+zo6FElfmY02yQbewpGZ1VOpG+I8xkeIlAgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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