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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c75b042bea2b486f721f3f92f27f0592376c7c4e79f2dec25ec5b65701fb4ed1' 
  AND token = '8wwJ3mtLomQjd0ukxiLvko+pFvdTFt/ca2v+TmXrs/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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