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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a568f3619fcc4163f06f5c9f155a1715a2aa52f2b1fff6b02859814e51b37dae' 
  AND token = 'xuJGmH+XTMet3ivGkoPbr/TYx4NkO2alxHlUSUQQ9eU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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