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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e581dfdfec11b2f571c9df2adaf7d56b4d5b308e788d7e7877927b0b7aa2eac' 
  AND token = 'mzz6t9/BN8x4Ww3E5x7SB+RnAJ84C7JT5ubvTc3vM9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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