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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23a7baae3341321d43985e320205ce8703b0699af7d526470ac1686f1477ef56' 
  AND token = 'Qb8REhleRLHUZSB9obfza+T9yh4m5HwplSoDWJ90gy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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