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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdea14becdbd291496c3f47d3a7c7af3873e70fc7e72ba76c92747837b3ee7aa' 
  AND token = 'faz6JV/xiLdXuohFZyFwnYHt2NhY08N0F+f7gxTAgDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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