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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab8b54016743bf092b40ec99ffbcc0b0e67102e73b28e01d91d353f456f5bd15' 
  AND token = '9rzyiRkfY2TwMm+r1fQ3I+1gMl5yvqR5MfeapySH1+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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